1. Health Services Research Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
2. National Institute for Health Research (NIHR) Applied Research Collaboration Oxford, Oxford, UK
3. Cambridge Cancer Centre, Cambridge University Hospitals NHS Foundation Trust (Addenbrooke's Hospital), Cambridge, UK
4. The Christie NHS Foundation Trust, Manchester, UK
5. University of Oxford Department of Oncology, Cancer Research UK Oxford Centre, Oxford, UK
6. Dermatology Department, Churchill Hospital, Oxford, UK